replace all instances of .ix

[wholmgren]

Pandas 0.20 deprecates the .ix indexer and we need to make a handful of minor changes to stay current.

https://github.com/pvlib/pvlib-python/search?utf8=✓&q=.ix&type=

http://pandas-docs.github.io/pandas-docs-travis/whatsnew.html#whatsnew-0200-api-breaking-deprecate-ix

I'd welcome a PR for this.

[morrme]

What do you want to change the references to: .loc or .iloc ? Seems like they should be .loc but I'd rather you make the call 👍

[cwhanse]

Depends whether we want position or label indexing. The problem with .ix is that it tried to handle both cases. From: morrme [mailto:notifications@github.com] Sent: Thursday, May 04, 2017 4:01 PM To: pvlib/pvlib-python <pvlib-python@noreply.github.com> Cc: Subscribed <subscribed@noreply.github.com> Subject: [EXTERNAL] Re: [pvlib/pvlib-python] replace all instances of .ix (#322) What do you want to change the references to: .locor .iloc ? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<#322 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AFJNLyRo0rb5pepsKqgLPZV4_f8KFdx9ks5r2kqrgaJpZM4NRLaK>.

[adriesse]

Are these methods ok?

df.column_name.[row_number]
df.column_name.iloc[row_number]
df.iloc[row_number].column_name

[wholmgren]

In timetimezones.rst, tmy3_data.ix[0:3, ['GHI', 'DNI', 'AOD']] becomes tmy3_data[tmy3_data.index[0:3], 'GHI', 'DNI', 'AOD']

In forecast.py, I think you can simply use [self.output_variables].

I think the case in irradiance.py will work with loc.